Question

chapter 8 discussion
answer the following questions in a minimum of five sentences each. your initial response to the discussion is due by wednesday. your two replies to classmates are due by sunday at 11:59 pm.

1. describe the path and all related steps that a molecule of oxygen would take from the air in the lungs to a muscle cell.
2. list the ways in which training improves the effectiveness of the cardiovascular and respiratory systems. what types of training employ to improve the effectiveness of these systems? how might you be able to train more effectively in your own life?

Explanation:

1. Oxygen first enters the lungs and diffuses across the alveolar - capillary membrane into the blood. It binds to hemoglobin in red blood cells. The oxygen - rich blood is then pumped by the heart through the arteries to smaller arterioles and finally to capillaries near muscle cells. Oxygen diffuses out of the capillaries and into the muscle cells.
2. Training improves cardiovascular and respiratory systems by increasing heart muscle strength, enhancing lung capacity, and improving oxygen - carrying capacity. Types of training include aerobic exercises like running and cycling, and strength - training which indirectly benefits these systems. To train more effectively, one can vary the intensity and type of exercise, set clear goals, and maintain a consistent training schedule.

Answer:

1. Oxygen enters lungs, diffuses into blood, binds to hemoglobin, travels via heart and blood vessels, and diffuses into muscle cells.
2. Training strengthens heart, increases lung capacity, and improves oxygen - carrying ability. Types include aerobic and strength - training. To train better, vary intensity, set goals, and be consistent.